Finally, trustworthy astrology in chat, with accurate data and interactive charts. Now a one-click app in the ChatGPT app directory, and a connector for Claude. For users: install, ask in plain language, then interact, learn, and grow. Trustworthy information where you already are. For developers: 120 REST endpoints, 92 typed MCP tools, the NASA JPL DE440 engine. Fast, accurate, sub-arcsecond ephemeris data. Build and integrate in minutes. Free to start, no card.
OpenEphemeris
Launch date
OpenEphemerisNASA-grade astrology data, drawn live inside Claude via MCP
Launched on September 1st, 2026